Question

我正在尝试将两个EditText值的值相加。我使用了另一个例子，其中我可以得到从另一个中减去一个EditText值并在EditText中显示该结果的结果。但是，我似乎无法弄清楚如何将两个加在一起并获得结果。当前两个EditText字段中包含值时，应自动计算结果。

我的代码如下：

type

“sTip”是从AmountReceived中减去totalCost的结果。因此，当用户键入交易的总成本，然后输入他们从客户收到的金额时，它会自动从客户计算他们的提示。

我正在尝试反过来，但我尝试的所有内容都会导致错误，或者只是无法正常工作。我希望如果用户输入totalCost和tip，它会显示AmountReceived。提前感谢任何可以指引我正确方向的人！

编辑：更新了代码

public void afterTextChanged(Editable s)
{
    eAmountReceived = (EditText) findViewById(R.id.amountReceived);
    eTotalCost = (EditText) findViewById(R.id.orderTotal);
    eTip = (EditText) findViewById(R.id.tip);
    eMileage = (EditText) findViewById(R.id.mileage);
    eGrandTotal = (EditText) findViewById(R.id.grandTotal);

    sAmountReceived = eAmountReceived.getText().toString();
    sTotalCost = eTotalCost.getText().toString();
    sMileage = eMileage.getText().toString();
    sTip = eTip.getText().toString();

    try
    {
        dAmountReceived = Double.parseDouble(sAmountReceived);
        dTotalCost = Double.parseDouble(sTotalCost);
        dSubtract = dAmountReceived - dTotalCost;
        dMileage = Double.parseDouble(sMileage);
        dGrandTotal = dSubtract + dMileage;


        dAdd = dTotalCost + dSubtract;


    } catch (NumberFormatException e){}

    sTip = String.valueOf(dSubtract);

    DecimalFormat df = new DecimalFormat("0.00");
    sTip = df.format(dSubtract);

    eTip.setText(sTip);

    sGrandTotal = String.valueOf(dGrandTotal);

    sGrandTotal = df.format(dGrandTotal);

    eGrandTotal.setText(sGrandTotal);
}

Answer 1

为每个edittext添加文本更改侦听器。例如，dTotalCost或dSubtract的侦听器将如下所示：

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编辑：添加界面TextWatcherand将其添加到editexts

dTotalCost.addTextChangedListener(new TextWatcher() {

@Override
public void afterTextChanged(Editable s) {}

@Override    
public void beforeTextChanged(CharSequence s, int start,
 int count, int after) {
}

@Override    
public void onTextChanged(CharSequence s, int start,
 int before, int count) {
  if(s.length() != 0)
   dAdd = dTotalCost + dSubtract;
  }
});

将两个edittext值一起添加并将结果显示在另一个edittext中

1 个答案: